Add a note to turn off automatic updates on Windows VMs

Could not figure out how to do this from the ps script so this will have to do
for now.

BUG=skia:3247

Review URL: https://codereview.chromium.org/803143003
Move logserver on webtry over to being managed by Skia Push.

BUG=skia:

Review URL: https://codereview.chromium.org/805873003
move prober to be managed by Skia Push.

BUG=skia:

Review URL: https://codereview.chromium.org/798883004
Forgot to add prober to skiapush.conf

TBR=rmistry
BUG=skia:

Review URL: https://codereview.chromium.org/801393004
Add probers for skiaalerts.com and skiapush.com. Fix probe for skiamonitor.com

Will add alerts based on these probes once we have collected data for a bit.

BUG=skia:3219

Review URL: https://codereview.chromium.org/794343005
Sort the package names so they appear in a stable order on the UI.

BUG=skia:

Review URL: https://codereview.chromium.org/793153003